TL074 and TL084 are functionally the same for our applications, as is TL064, the difference is in power consumption, noise and offset, but I wonder if the difference is at all noticeable.

As for PSU voltage, I think mine is running at +/-12v without a problem. Not sure which incarnation of the SSM2044 filter this is, but you have to make sure you tie the low end side of the cutoff pot with a resistor to V- instead of ground. This increases the range, and improves the filter a lot.

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